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    <script>
        //ES6 允许给函数参数赋初始值

        //1、形参初始值，具有默认值的参数，一般位置放在后面
        function add(a,b,c=10){
            return a + b+ c;
        }
        console.log(add(1,3)); //14

        //2、与解构赋值结合
        function connect({host,username,password,port}){
            console.log(host);
            console.log(username);
            console.log(password);
            console.log(port);
        }
        connect({
            host:'123',
            username:'root',
            password:'123',
            port:2208
        })

    </script>
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